Pub Date : 2022-02-10DOI: 10.3329/dujbs.v31i1.57912
Md. Amir Hossain, Khandakar Taki Md Sadi, Nilima Jannat, Mk Rahman
A pot experiment was conducted to evaluate the effects of organic manures and inorganic fertilizers on the growth and yield of red capsicum (Capsicum annuum L.). It was conducted on rooftop of a building in Bogura town, Bogura. The experiment consisted of twelve treatments with three replications and was laid out in Randomized Complete Block Design (RCBD). Treatments were T1: Control (-OM and -NPK), T2: 4 ton Nafco ha-1 + N23P10K25 kgha-1, T3: 4 ton ACI ha-1 + N23P10K25 kgha-1, T4: 4 ton Trichocompost ha-1 + N23P10K25 kgha-1, T5: 4 ton Kazi Farms ha-1 + N23P10K25 kgha-1, T6: 4 ton Mimpex ha-1 + N23P10K25 kgha-1, T7: 4 ton Mazim ha-1 + N23P10K25 kgha-1, T8: 4 ton McDonald ha-1 + N23P10K25 kgha-1, T9: 4 ton Paragon ha-1 + N23P10K25 kgha-1, T10: 4 ton Kazi Agro ha-1 + N23P10K25 kgha-1, T11: 4 ton Vermicompost ha-1 + N23P10K25 kgha-1 and T12:N46P20K50 kgha-1. Highest plant height (33.81 cm), leaf area (87.22 cm2 plant-1), number of leaves (43 plant-1), number of branches (6 plant-1), number of fruits (11 plant-1), fresh weight (0.60 g plant-1) and dry weight (12.67 g plant-1) were observed in treatment T4: 4 ton Trichocompost ha-1 + N23P10K25 kgha-1. Highest girth (3.18 cm) was observed in treatment T7: 4 ton Mazim ha-1 + N23P10K25 kgha-1. The overall best growth performance was achieved in T4: 4 ton Trichocompost ha-1 + N23P10K25 kgha-1 treatment. Dhaka Univ. J. Biol. Sci. 31(1): 9-18, 2022 (January)
{"title":"Combined Effects of Organic Manures and Chemical Fertilizers on Growth and Yield of Red Capsicum (Capsicum Annuum L.) Grown at Rooftop","authors":"Md. Amir Hossain, Khandakar Taki Md Sadi, Nilima Jannat, Mk Rahman","doi":"10.3329/dujbs.v31i1.57912","DOIUrl":"https://doi.org/10.3329/dujbs.v31i1.57912","url":null,"abstract":"A pot experiment was conducted to evaluate the effects of organic manures and inorganic fertilizers on the growth and yield of red capsicum (Capsicum annuum L.). It was conducted on rooftop of a building in Bogura town, Bogura. The experiment consisted of twelve treatments with three replications and was laid out in Randomized Complete Block Design (RCBD). Treatments were T1: Control (-OM and -NPK), T2: 4 ton Nafco ha-1 + N23P10K25 kgha-1, T3: 4 ton ACI ha-1 + N23P10K25 kgha-1, T4: 4 ton Trichocompost ha-1 + N23P10K25 kgha-1, T5: 4 ton Kazi Farms ha-1 + N23P10K25 kgha-1, T6: 4 ton Mimpex ha-1 + N23P10K25 kgha-1, T7: 4 ton Mazim ha-1 + N23P10K25 kgha-1, T8: 4 ton McDonald ha-1 + N23P10K25 kgha-1, T9: 4 ton Paragon ha-1 + N23P10K25 kgha-1, T10: 4 ton Kazi Agro ha-1 + N23P10K25 kgha-1, T11: 4 ton Vermicompost ha-1 + N23P10K25 kgha-1 and T12:N46P20K50 kgha-1. Highest plant height (33.81 cm), leaf area (87.22 cm2 plant-1), number of leaves (43 plant-1), number of branches (6 plant-1), number of fruits (11 plant-1), fresh weight (0.60 g plant-1) and dry weight (12.67 g plant-1) were observed in treatment T4: 4 ton Trichocompost ha-1 + N23P10K25 kgha-1. Highest girth (3.18 cm) was observed in treatment T7: 4 ton Mazim ha-1 + N23P10K25 kgha-1. The overall best growth performance was achieved in T4: 4 ton Trichocompost ha-1 + N23P10K25 kgha-1 treatment.\u0000Dhaka Univ. J. Biol. Sci. 31(1): 9-18, 2022 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"40 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91401789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-10DOI: 10.3329/dujbs.v31i1.57923
Monoara Begum, Md. Nasimul Gani, Md Didar Ul Alam
An experiment was conducted to study the effect of textile wastewater on growth and yield components of rice (Oryza sativa L.). The treatments wereT1: Control, T2: Sole RDF (Recommended Dose of Fertilizer) + FW (Fresh Water), T3: 50% RDF + 25% TWW (Textile Waste Water), T4: 50% RDF + 50% TWW, T5: 50% RDF + 75% TWW, T6: 50% RDF + 100% TWW. The highest plant height (134.1 cm), tiller number at maturity stage (344/m2), straw yield (6.94 t/ha),grain yield (4.25 t/ha), panicle number (306/m2), panicle length (24.57cm), number of grain/ panicle (118.5), percent of filled grain/panicle (85.07%) and 1000-grain weight (13.77gm) were found inT2. And the second highest plant height (124.2 cm), tiller number at maturity stage (342/m2), grain yield (3.97 t/ha), panicle number (301/m2), panicle length (24.12cm), number of grain per panicle (117.2), percent of filled grain/panicle (84.17%) and 1000-grain weight (13.37gm) were found in T4.And T5 gave the second highest yield of straw (6.05 t/ha). Although highest values were found in T2, but statistically the achievements indicate that there was little difference between the T2 and T4 treatments. The overall findings of this study indicated that where fresh water is scarce application of 50% RDF along with 50% TWW irrigation may be a good indicator to achieve better growth and yield of rice. Dhaka Univ. J. Biol. Sci. 31(1): 147-157, 2022 (January)
{"title":"Effects of Textile Wastewater on Growth and Yield Components of Rice (Oryza Sativa L.)","authors":"Monoara Begum, Md. Nasimul Gani, Md Didar Ul Alam","doi":"10.3329/dujbs.v31i1.57923","DOIUrl":"https://doi.org/10.3329/dujbs.v31i1.57923","url":null,"abstract":"An experiment was conducted to study the effect of textile wastewater on growth and yield components of rice (Oryza sativa L.). The treatments wereT1: Control, T2: Sole RDF (Recommended Dose of Fertilizer) + FW (Fresh Water), T3: 50% RDF + 25% TWW (Textile Waste Water), T4: 50% RDF + 50% TWW, T5: 50% RDF + 75% TWW, T6: 50% RDF + 100% TWW. The highest plant height (134.1 cm), tiller number at maturity stage (344/m2), straw yield (6.94 t/ha),grain yield (4.25 t/ha), panicle number (306/m2), panicle length (24.57cm), number of grain/ panicle (118.5), percent of filled grain/panicle (85.07%) and 1000-grain weight (13.77gm) were found inT2. And the second highest plant height (124.2 cm), tiller number at maturity stage (342/m2), grain yield (3.97 t/ha), panicle number (301/m2), panicle length (24.12cm), number of grain per panicle (117.2), percent of filled grain/panicle (84.17%) and 1000-grain weight (13.37gm) were found in T4.And T5 gave the second highest yield of straw (6.05 t/ha). Although highest values were found in T2, but statistically the achievements indicate that there was little difference between the T2 and T4 treatments. The overall findings of this study indicated that where fresh water is scarce application of 50% RDF along with 50% TWW irrigation may be a good indicator to achieve better growth and yield of rice.\u0000Dhaka Univ. J. Biol. Sci. 31(1): 147-157, 2022 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"56 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81953812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-10DOI: 10.3329/dujbs.v31i1.57915
Mohammad Azmal Hossain Bhuiyan, M. Islam, S. Islam, A. Kowser, M. Khondker
Information of phytoplankton flora of polluted river ecosystems of Bangladesh are scanty. The present study was undertaken to explore the phytoplankton flora at Dakshin Rupshi Station of the river Shitalakhsya, Narayanganj, Dhaka. The study was carried out from May 2017 to March 2018 by collecting pelagic plankton samples bimonthly. A total of 53 species under 36 genera were identified, of which 51 species have been illustrated through photomicrographic images and listing. Two species of phytoplankton namely, Pyrobotrys incurva Arnoldi and Phacus ranula Pochmann were identified from the river water but could not be produced here. The recorded algal divisions of phytoplankton are Cyanophyta (6), Chlorophyta (19), Euglenophyta (13), Chrysophyta (13) and Pyrrhophyta (2). The standing crops presented by each division are: 463.5, 428.33, 199.67, 664.33 and 26.25×103 ind/l by Cyanophyta, Chlorophyta, Euglenophyta, Chrysophyta and Pyrrhophyta, respectively. The trend in contributing the number of species is Chlorophyta > Euglenophyta and Chrysophyta > Cyanophyta > Pyrrhophyta. For standing crop, the trend is Chrysophyta > Cyanophyta > Chlorophyta > Euglenophyta > Pyrrhophyta. Pollutant loading from the urban sources actually cuts the penetration of light into the upper part of the river water and thus creating a shrinking environment for the survival of phytoplankton. The present floristic study of phytoplankton of the River Shitalakhsya adds knowledge to the species composition and their systematic position which would be helpful for any further floristic study of phytoplankton on the river ecosystems of Bangladesh. Dhaka Univ. J. Biol. Sci. 31(1): 45-57, 2022 (January)
{"title":"Floristic Composition of Plankton in Shitalakhsya River, Narayanganj, Dhaka","authors":"Mohammad Azmal Hossain Bhuiyan, M. Islam, S. Islam, A. Kowser, M. Khondker","doi":"10.3329/dujbs.v31i1.57915","DOIUrl":"https://doi.org/10.3329/dujbs.v31i1.57915","url":null,"abstract":"Information of phytoplankton flora of polluted river ecosystems of Bangladesh are scanty. The present study was undertaken to explore the phytoplankton flora at Dakshin Rupshi Station of the river Shitalakhsya, Narayanganj, Dhaka. The study was carried out from May 2017 to March 2018 by collecting pelagic plankton samples bimonthly. A total of 53 species under 36 genera were identified, of which 51 species have been illustrated through photomicrographic images and listing. Two species of phytoplankton namely, Pyrobotrys incurva Arnoldi and Phacus ranula Pochmann were identified from the river water but could not be produced here. The recorded algal divisions of phytoplankton are Cyanophyta (6), Chlorophyta (19), Euglenophyta (13), Chrysophyta (13) and Pyrrhophyta (2). The standing crops presented by each division are: 463.5, 428.33, 199.67, 664.33 and 26.25×103 ind/l by Cyanophyta, Chlorophyta, Euglenophyta, Chrysophyta and Pyrrhophyta, respectively. The trend in contributing the number of species is Chlorophyta > Euglenophyta and Chrysophyta > Cyanophyta > Pyrrhophyta. For standing crop, the trend is Chrysophyta > Cyanophyta > Chlorophyta > Euglenophyta > Pyrrhophyta. Pollutant loading from the urban sources actually cuts the penetration of light into the upper part of the river water and thus creating a shrinking environment for the survival of phytoplankton. The present floristic study of phytoplankton of the River Shitalakhsya adds knowledge to the species composition and their systematic position which would be helpful for any further floristic study of phytoplankton on the river ecosystems of Bangladesh.\u0000Dhaka Univ. J. Biol. Sci. 31(1): 45-57, 2022 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88046413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-10DOI: 10.3329/dujbs.v31i1.57913
MM Islam, A. Hossain, S. Mandal
Fish biodiversity largely depends on different environmental factors including water quality parameters. The current study was conducted to investigate the impacts of water quality variables on fish biodiversity at upstream and downstream of the river Meghna in dry and rainy season in 2011. Twelve water samples and 66 fish samples were collected from 2 different sampling stations of the river Meghna during the study period where 61 were finfish species and 5 were shellfish species. The number of finfish and shellfish catch at upstream in both dry and rainy seasons were significantly higher than that of downstream (p<0.01). Shannon-Weiner index and species richness were determined where significantly higher Shannon-Weiner index was observed at upstream in dry season than that of downstream (p<0.01) and similar species richness was observed at upstream and downstream in both of the seasons. Significant correlation was observed between physicochemical parameters and the fish biodiversity indices. The obtained results suggested that the changes in environmental parameters of water including conductivity, pH, DO, BOD had significant impacts on Shannon-Wiener indices at downstream which indicate the water quality detarioration. This findings have the implications in designing polices to sustain the finfish and shellfish biodiversity and to mitigate the environmental changes in the river Meghna. Dhaka Univ. J. Biol. Sci. 31(1): 19-27, 2022 (January)
{"title":"Impacts of Water Quality on Finfish and Shellfish Biodiversity in the River Meghna","authors":"MM Islam, A. Hossain, S. Mandal","doi":"10.3329/dujbs.v31i1.57913","DOIUrl":"https://doi.org/10.3329/dujbs.v31i1.57913","url":null,"abstract":"Fish biodiversity largely depends on different environmental factors including water quality parameters. The current study was conducted to investigate the impacts of water quality variables on fish biodiversity at upstream and downstream of the river Meghna in dry and rainy season in 2011. Twelve water samples and 66 fish samples were collected from 2 different sampling stations of the river Meghna during the study period where 61 were finfish species and 5 were shellfish species. The number of finfish and shellfish catch at upstream in both dry and rainy seasons were significantly higher than that of downstream (p<0.01). Shannon-Weiner index and species richness were determined where significantly higher Shannon-Weiner index was observed at upstream in dry season than that of downstream (p<0.01) and similar species richness was observed at upstream and downstream in both of the seasons. Significant correlation was observed between physicochemical parameters and the fish biodiversity indices. The obtained results suggested that the changes in environmental parameters of water including conductivity, pH, DO, BOD had significant impacts on Shannon-Wiener indices at downstream which indicate the water quality detarioration. This findings have the implications in designing polices to sustain the finfish and shellfish biodiversity and to mitigate the environmental changes in the river Meghna.\u0000Dhaka Univ. J. Biol. Sci. 31(1): 19-27, 2022 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"87 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83782862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-10DOI: 10.3329/dujbs.v31i1.57924
P. Chowdhury, S. Shamsi, H. Begum, M. A. Bashar
A pot experiment was conducted with the single and combined doses of fungicides, plant extracts and antagonist for the management of nine rice pathogens. A total of 13 treatments including controls with or without inocula of the pathogen were tested. Amongst all the treatments only T6 (Bavistin + Azadirachta indica + Trichoderma harzianum) showed highest percentage of seed germination and seedling vigor index of seeds inoculated with Alternaria alternata , Aspergillus flavus, Curvularia lunata and Pestalotiopsis guepinii. Next to T6, T10 (Bavistin + Tall + Azadirachta indica + Citrus medica) showed promising result against Drechslera oryzae, Fusarium moniliforme, Microdochium oryzae and Sarocladium oryzae. T3 treatment (Azadirachta indica) showed highest percentage of seed germination and seedling vigor index in case of seeds inoculated with Fusarium solani. Amongst all treatments the integrated use of Bavistin, A. indica and T. harzianum showed the better performance for growth reduction of test pathogens and increased germination of seeds. Dhaka Univ. J. Biol. Sci. 31(1): 159-168, 2022 (January)
{"title":"Integrated Management of Seed Borne Pathogenic Fungi Of Brri 29 Rice Variety","authors":"P. Chowdhury, S. Shamsi, H. Begum, M. A. Bashar","doi":"10.3329/dujbs.v31i1.57924","DOIUrl":"https://doi.org/10.3329/dujbs.v31i1.57924","url":null,"abstract":"A pot experiment was conducted with the single and combined doses of fungicides, plant extracts and antagonist for the management of nine rice pathogens. A total of 13 treatments including controls with or without inocula of the pathogen were tested. Amongst all the treatments only T6 (Bavistin + Azadirachta indica + Trichoderma harzianum) showed highest percentage of seed germination and seedling vigor index of seeds inoculated with Alternaria alternata , Aspergillus flavus, Curvularia lunata and Pestalotiopsis guepinii. Next to T6, T10 (Bavistin + Tall + Azadirachta indica + Citrus medica) showed promising result against Drechslera oryzae, Fusarium moniliforme, Microdochium oryzae and Sarocladium oryzae. T3 treatment (Azadirachta indica) showed highest percentage of seed germination and seedling vigor index in case of seeds inoculated with Fusarium solani. Amongst all treatments the integrated use of Bavistin, A. indica and T. harzianum showed the better performance for growth reduction of test pathogens and increased germination of seeds.\u0000Dhaka Univ. J. Biol. Sci. 31(1): 159-168, 2022 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"333 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80575520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-10DOI: 10.3329/dujbs.v31i1.57922
S. Ganguly, S. Pattnaik
The present investigation was undertaken to predict the amount of Lglutamic acid production by a mutant Corynebacterium glutamicum X680 using mathematical model emphasizing Bona and Moser (1997) hypotheses. This model was able to predict the experimental data with the minimum value of sum squares of weighted residues (sswr) 0.161. This model claimed that an increase in non-growth associated product formation coefficient led to maximum negative impact on L-glutamic acid production. Dhaka Univ. J. Biol. Sci. 31(1): 137-146, 2022 (January)
{"title":"Comparison Between the Predicted and Experimental L-Glutamic Acid Production by Free Cells Of Corynebacterium Glutamicum x680 Using Mathematical Model","authors":"S. Ganguly, S. Pattnaik","doi":"10.3329/dujbs.v31i1.57922","DOIUrl":"https://doi.org/10.3329/dujbs.v31i1.57922","url":null,"abstract":"The present investigation was undertaken to predict the amount of Lglutamic acid production by a mutant Corynebacterium glutamicum X680 using mathematical model emphasizing Bona and Moser (1997) hypotheses. This model was able to predict the experimental data with the minimum value of sum squares of weighted residues (sswr) 0.161. This model claimed that an increase in non-growth associated product formation coefficient led to maximum negative impact on L-glutamic acid production.\u0000Dhaka Univ. J. Biol. Sci. 31(1): 137-146, 2022 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"85 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88860826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-10DOI: 10.3329/dujbs.v31i1.57926
M. Mohammad, N. Sultana, A. Begum, Md. Niamul Naser
Hypneasp. is the most common economically potential seaweed species inBangladesh. In this experiment, an initiative was taken to formulate fish feedusing seaweed (Hypneasp.) that can improve the immunity of Nile Tilapia,Oreochromisniloticus. Seaweed was supplemented in different percentages withcommercial feed to evaluate their effects on their serum bactericidal activities. A90-days experiment was conducted under five treatments – T1 (5% seaweed), T2(10% seaweed), T3 (15% seaweed), T4 (20% seaweed) and C (only commercialfeed) with a replica for each. Fish blood was collected, serum was separated fromblood and serum bactericidal activity was tested. Blood serum of 10% seaweedtreated fish showed the highest sensitivity against three bacteria (Bacillus cereus,Salmonella typhimurium, Shigellaflexneri) followed by 5% seaweed which showedsensitivity against Bacillus cereus and slightly against Salmonella typhimuriumandShigellaflexneriand 15% seaweed showed slight bactericidal activity againstBacillus cereus only, whereas, no bactericidal activity was observed for controland 20% seaweed treated fishes. The result indicates that the use of an optimumamount of seaweed supplements can improve the immunity system of Niletilapia which can prevent the growth of bacteria and likely make fishes safe forhuman consumption. Dhaka Univ. J. Biol. Sci. 31(1): 177-181, 2022 (January)
{"title":"Seaweed (Hypnea SP.) Supplementation in Feed Play Role in Boosting Immunity of Nile Tilapia (Oreochromis Niloticus)","authors":"M. Mohammad, N. Sultana, A. Begum, Md. Niamul Naser","doi":"10.3329/dujbs.v31i1.57926","DOIUrl":"https://doi.org/10.3329/dujbs.v31i1.57926","url":null,"abstract":"Hypneasp. is the most common economically potential seaweed species inBangladesh. In this experiment, an initiative was taken to formulate fish feedusing seaweed (Hypneasp.) that can improve the immunity of Nile Tilapia,Oreochromisniloticus. Seaweed was supplemented in different percentages withcommercial feed to evaluate their effects on their serum bactericidal activities. A90-days experiment was conducted under five treatments – T1 (5% seaweed), T2(10% seaweed), T3 (15% seaweed), T4 (20% seaweed) and C (only commercialfeed) with a replica for each. Fish blood was collected, serum was separated fromblood and serum bactericidal activity was tested. Blood serum of 10% seaweedtreated fish showed the highest sensitivity against three bacteria (Bacillus cereus,Salmonella typhimurium, Shigellaflexneri) followed by 5% seaweed which showedsensitivity against Bacillus cereus and slightly against Salmonella typhimuriumandShigellaflexneriand 15% seaweed showed slight bactericidal activity againstBacillus cereus only, whereas, no bactericidal activity was observed for controland 20% seaweed treated fishes. The result indicates that the use of an optimumamount of seaweed supplements can improve the immunity system of Niletilapia which can prevent the growth of bacteria and likely make fishes safe forhuman consumption.\u0000Dhaka Univ. J. Biol. Sci. 31(1): 177-181, 2022 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75572056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-10DOI: 10.3329/dujbs.v31i1.57920
A. Islam, Z. Khan, M. Hussain, M. Uddin
Scanning electron microscopic (SEM) analysis of clay samples from four different soil series, viz. Binsara, Taras, Jaonia, and Manda in the Lower Atrai Basin of Bangladesh was performed to characterize the clay minerals. The micrographs of SEM were obtained at three different magnification levels, such as low (2,000x), medium (5,000x), and high (10,000x). The SEM proved to be ideally feasible for studying the size, shape, texture, and fabric of clay samples. The electron micrographs of clays in the Binsara soil series have shown well-formed six-sided flakes. These six-sided flake particles are 1 : 1 type (well-crystallized) kaolinite minerals. The lath-shaped, rounded flakes are the well crystallized 2:1 type illite mineral in clays of Taras and Jaonia soil series. The rod-shaped fluffy masses/flakes are the indication of the presence of 2 : 1 type vermiculite in the clays of Manda soil series. The rounded particles in all soils are quartz grains. Dhaka Univ. J. Biol. Sci. 31(1): 105-115, 2022 (January)
{"title":"Scanning Electron Microscopic Analysis of Clays in The Soils of Lower Atrai Basin of Bangladesh","authors":"A. Islam, Z. Khan, M. Hussain, M. Uddin","doi":"10.3329/dujbs.v31i1.57920","DOIUrl":"https://doi.org/10.3329/dujbs.v31i1.57920","url":null,"abstract":"Scanning electron microscopic (SEM) analysis of clay samples from four different soil series, viz. Binsara, Taras, Jaonia, and Manda in the Lower Atrai Basin of Bangladesh was performed to characterize the clay minerals. The micrographs of SEM were obtained at three different magnification levels, such as low (2,000x), medium (5,000x), and high (10,000x). The SEM proved to be ideally feasible for studying the size, shape, texture, and fabric of clay samples. The electron micrographs of clays in the Binsara soil series have shown well-formed six-sided flakes. These six-sided flake particles are 1 : 1 type (well-crystallized) kaolinite minerals. The lath-shaped, rounded flakes are the well crystallized 2:1 type illite mineral in clays of Taras and Jaonia soil series. The rod-shaped fluffy masses/flakes are the indication of the presence of 2 : 1 type vermiculite in the clays of Manda soil series. The rounded particles in all soils are quartz grains.\u0000Dhaka Univ. J. Biol. Sci. 31(1): 105-115, 2022 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"179 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89669766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-10DOI: 10.3329/dujbs.v31i1.57917
Ebtisamul Zannat Mim, M. Jaman, A.G.J. Morshed, M. M. Alam, Nasrin Akter Bristy
Northern River Terrapin, Batagur baska, is an ecologically extinct species in Bangladesh. The ‘Project Batagur’ has undertaken some important initiatives to resuscitate the nearly deceased population through captive breeding at Bhawal National Park, Gazipur, Bangladesh. We conducted a study on breeding biology of B. baska from May 2016 to June 2017 in the project site. Four adult females and three adult males comprised breeding pair in the study site. Male Batagur baska developed black colouration on head and neck, with rich crimson on dorsal portion of the neck during breeding season. During our study, we observed paired basking behaviour rather courtship and parental care. We found three nests from mid-March to first week of April. Females laid eggs at night and a total of 67 eggs were extracted from three nests; eggs were elliptical and whitish in colour. Clutch size varied from 18 to 28 eggs. There was significant positive correlation between clutch size and nest diameter (p = 0.03). The relationship was also positive and significant between egg weight and diameter (p = 0.01).The size of the egg was not related with the size of breeding females (r = 0.143).Average incubation period was (68.26 ± 5.23) days and there was significant negative relationship with temperature (p= 0.000), clutch size (p = 0.001), and hatching success (p = 0.004). Hatching success was also negatively co-related with temperature (p= 0.001). Hatching started in May and ended in the first week of June 2017 with mean hatching success of 91%. Simple linear regression showed positive relationship between egg length and hatchlings’ carapace length, plastron length, and height. We also found positive relationship between egg diameter and hatchlings weight, and carapace width. This study can be used as a protocol for captive breeding and rearing activities of threatened chelonians around the world. Dhaka Univ. J. Biol. Sci. 31(1): 67-78, 2022 (January)
{"title":"Breeding Biology of Northern River Terrapin Batagur Baska in Captivity in Bangladesh","authors":"Ebtisamul Zannat Mim, M. Jaman, A.G.J. Morshed, M. M. Alam, Nasrin Akter Bristy","doi":"10.3329/dujbs.v31i1.57917","DOIUrl":"https://doi.org/10.3329/dujbs.v31i1.57917","url":null,"abstract":"Northern River Terrapin, Batagur baska, is an ecologically extinct species in Bangladesh. The ‘Project Batagur’ has undertaken some important initiatives to resuscitate the nearly deceased population through captive breeding at Bhawal National Park, Gazipur, Bangladesh. We conducted a study on breeding biology of B. baska from May 2016 to June 2017 in the project site. Four adult females and three adult males comprised breeding pair in the study site. Male Batagur baska developed black colouration on head and neck, with rich crimson on dorsal portion of the neck during breeding season. During our study, we observed paired basking behaviour rather courtship and parental care. We found three nests from mid-March to first week of April. Females laid eggs at night and a total of 67 eggs were extracted from three nests; eggs were elliptical and whitish in colour. Clutch size varied from 18 to 28 eggs. There was significant positive correlation between clutch size and nest diameter (p = 0.03). The relationship was also positive and significant between egg weight and diameter (p = 0.01).The size of the egg was not related with the size of breeding females (r = 0.143).Average incubation period was (68.26 ± 5.23) days and there was significant negative relationship with temperature (p= 0.000), clutch size (p = 0.001), and hatching success (p = 0.004). Hatching success was also negatively co-related with temperature (p= 0.001). Hatching started in May and ended in the first week of June 2017 with mean hatching success of 91%. Simple linear regression showed positive relationship between egg length and hatchlings’ carapace length, plastron length, and height. We also found positive relationship between egg diameter and hatchlings weight, and carapace width. This study can be used as a protocol for captive breeding and rearing activities of threatened chelonians around the world.\u0000Dhaka Univ. J. Biol. Sci. 31(1): 67-78, 2022 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81962829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The research was carried out at Lal Teer Seed Ltd. Gazipur to determine the heterosis of yield and yield contributing traits of pumpkin (Cucurbita moschata Duch. ex Poir.). Six diverse pumpkin parents (viz. CM-1, BARI Mistikumra-1, CM-20 and CM-8) and their 30 F1 hybrids derived from 6X6 diallel including reciprocal were used as research materials. Thirteen genetic parameters [viz. days to first male flower opening, days to first female flower opening, number of flowers (male and female) per plant, fruit length and diameter (cm), fruit weight (kg), flesh thickness (cm), brix (%), number of fruits per plant, number of seeds per fruit, 100-seeds weight (g), yield per plant (kg)] were estimated. The results revealed significantly higher and positive heterosis and expected negative effects for different important characters of pumpkin. The two cross combinations namely; CM-1 × BARI Mistikumra-1 and CM-8 × CM-1 were identified as the promising hybrids which showed the significant higher heterosis, heterobeltiosis and standard heterosis. These finding suggest that cross combinations of indigenous x exotic parents may be beneficial for fruit yield, particularly when used as commercial hybrids. The results showed that these two combinations gave the most promising hybrids (F1), so these two F1 lines were registered in National Seed Board (NSB) of Bangladesh as Hajee F1 and Danesh F1 hybrid varieties. Dhaka Univ. J. Biol. Sci. 31(1): 117-136, 2022 (January)
{"title":"Heterosis Analysis in Pumpkin (Cucurbitamoschata Duch. Ex. Poir)","authors":"Gazi Md Mohsin, Md. Sajedur Rahman Rahman, Farruk Ahamed, -. Md Hasanuzzaman","doi":"10.3329/dujbs.v31i1.57921","DOIUrl":"https://doi.org/10.3329/dujbs.v31i1.57921","url":null,"abstract":"The research was carried out at Lal Teer Seed Ltd. Gazipur to determine the heterosis of yield and yield contributing traits of pumpkin (Cucurbita moschata Duch. ex Poir.). Six diverse pumpkin parents (viz. CM-1, BARI Mistikumra-1, CM-20 and CM-8) and their 30 F1 hybrids derived from 6X6 diallel including reciprocal were used as research materials. Thirteen genetic parameters [viz. days to first male flower opening, days to first female flower opening, number of flowers (male and female) per plant, fruit length and diameter (cm), fruit weight (kg), flesh thickness (cm), brix (%), number of fruits per plant, number of seeds per fruit, 100-seeds weight (g), yield per plant (kg)] were estimated. The results revealed significantly higher and positive heterosis and expected negative effects for different important characters of pumpkin. The two cross combinations namely; CM-1 × BARI Mistikumra-1 and CM-8 × CM-1 were identified as the promising hybrids which showed the significant higher heterosis, heterobeltiosis and standard heterosis. These finding suggest that cross combinations of indigenous x exotic parents may be beneficial for fruit yield, particularly when used as commercial hybrids. The results showed that these two combinations gave the most promising hybrids (F1), so these two F1 lines were registered in National Seed Board (NSB) of Bangladesh as Hajee F1 and Danesh F1 hybrid varieties.\u0000Dhaka Univ. J. Biol. Sci. 31(1): 117-136, 2022 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79102328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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